Hybrid UWB Session Scheduling for Multi-Host Discovery and Sync
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Solution Overview
Problem
Existing technologies face challenges in efficiently managing device discovery and synchronization in ultra-wide band (UWB) communication, particularly in multi-host scenarios, which are crucial for applications like payment systems.
Innovation Solution
A method and device for UWB communication that employs a hybrid UWB session comprising contention-based ranging (CBR) and two-way ranging (TWR) phases to facilitate efficient device discovery and synchronization among multiple electronic devices, enabling secure and accurate ranging and positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional UWB session management is used, then device discovery and synchronization can be achieved, but the system cannot efficiently handle multi-host scenarios with multiple electronic devices
Solution Approach 1:
The patent segments the UWB session into distinct phases: CBR phase for device discovery and TWR phase for synchronization and positioning. This segmentation allows each phase to be optimized independently and enables efficient multi-host management by clearly defining when devices can participate in discovery versus when they must synchronize with specific hosts.
Solution Approach 2:
The patent implements dynamic session configuration where the roles of electronic devices can change during operation. Devices can transition between being a host, a controlled device, or a bystander based on the current phase and requirements. This dynamic role assignment enables flexible multi-host scenarios without requiring complex static configuration of all possible device interactions.
2Productivity
If contention-based ranging is used for device discovery, then multiple devices can be discovered efficiently, but synchronization accuracy may be compromised
Solution Approach 1:
The patent separates device discovery (CBR phase) from synchronization (TWR phase) into distinct temporal segments. During the CBR phase, multiple devices can efficiently discover each other through contention-based mechanisms. Then, in the TWR phase, synchronization occurs through dedicated two-way ranging exchanges between specific host-controlled device pairs, ensuring high accuracy without interference from simultaneous discovery operations.
Solution Approach 2:
The patent performs preliminary device discovery and identification during the CBR phase before proceeding to synchronization. This preliminary action allows the system to identify which devices need to be synchronized and establish the appropriate pairing relationships before initiating the more precise but slower TWR synchronization process, thereby optimizing both efficiency and accuracy.
3Measurement precision
If two-way ranging is performed for synchronization, then positioning accuracy is improved, but the time required for synchronization increases
Solution Approach 1:
The patent segments the overall operation into a rapid CBR discovery phase followed by a focused TWR synchronization phase. By completing device identification and pairing decisions during the CBR phase, the subsequent TWR phase only needs to perform the necessary synchronization measurements between already-identified device pairs, reducing the total time required compared to performing full TWR exchanges for all possible device combinations.
Solution Approach 2:
The patent applies partial TWR action by performing two-way ranging only between specific host-controlled device pairs that require synchronization, rather than performing exhaustive TWR measurements between all possible device combinations. This selective approach maintains positioning accuracy for the required device pairs while significantly reducing overall synchronization time.
Data Source
AI summary
A method performed by a first electronic device using ultra-wide band (UWB) communication is provided. The method includes establishing a UWB session based on information related to the UWB session, broadcasting a control message using the UWB session, and performing communication with a second electronic device and a third electronic device based on the control message, wherein the UWB session of a first ranging interval includes a hybrid UWB (HUS) session including at least one contention-based ranging (CBR) phase and at least one first two-way ranging (TWR) phase, and a second TWR session.